SplFixedArray - infinite loop

loop.php

<?php
// https://3v4l.org/LDQ6i

// Arrange
$object = new SplFixedArray(2);
$object[0] = 'first-value';
$object[1] = 'second-value';

// Act
foreach ($object as $key1 => $val1) {
    foreach ($object as $key2 => $val2) {
        break;
    }
}

// Assert
// Will never execute...
echo "Hello World!";